AP4

AP stands for Allmänna Pensionsfonden, Sweden's national pension fund. The numbered AP funds are the buffer of the state income pension: contributions from today's workers pay today's pensioners, and in years when contributions fall short, the AP funds cover the difference.

The first three fund boards were set up in 1960 alongside the ATP supplementary pension, restricted to fixed income. A fourth was added in 1974 to buy Swedish listed shares, and a sixth in 1996 to invest in unlisted companies — which is why AP6 is the private-equity specialist of the family. The 2001 pension reform rebuilt AP1–AP4 as four buffer funds with identical mandates, splitting SEK 554 billion equally between them. Several funds with one mandate is the point, not an accident: the buffer was split between independent managers to spread the system's risk and to set the funds in competition, so their results can be compared against each other.

On 1 January 2026 the five buffer funds became three: AP1 was closed and its assets were split between AP3 and AP4, and AP6 was merged into AP2, which may now hold up to half its assets in unlisted investments. Each fund's commitments are still recorded under the entity that made them, so all five appear in the LP ranking.